It was Champions Day in IndyCar, Playoffs Launch Day in NASCAR and Startline Chaos Day in Formula 1, making last Sunday a visual feast for racing fans on the tube. So how did it all play out in the ratings?

The Playoffs-opening Monster Energy NASCAR Cup race from Chicagoland scored a 1.41 rating and averaged 2.3 million viewers on NBCSN Sunday afternoon. That's down from a 1.64/2.7m for this race last year on the same network, but at least up from the disappointing 1.2 rating for the previous week's regular season finale in Richmond, which was the worst rating for a Cup race since at least 2000, according to SportsMediaWatch.

The Verizon IndyCar Series championship finale from Sonoma followed directly after the Cup race on NBCSN, and the early evening telecast scored a 0.33 rating, averaging 528,000 viewers. That's down fractionally from last year's 0.34/536,000 for this race, but less of a drop than NASCAR's.

The NASCAR Xfinity Series round from Chicagoland Saturday on NBCSN scored a 0.53/807,000. Last year the same race aired on the NBC broadcast network, where it scored a much stronger 1.09/1.7m.

The Formula 1 Singapore Grand Prix scored a 0.28/450,000 for its early morning live telecast on NBCSN, identical to its rating for this race last year on the same network (0.28/419,000).